package designmodel.observe2.notify;

import designmodel.observe2.observer.Observer;

/**
 * @author 陈泰来
 * @version V1.0
 * @Project echo-java-base
 * @Title 抽象通知者
 * @Description *
 * @Package designmodel.observe2.subject
 * @date 2021/3/4 11:33 上午
 * @Copyright:学如逆水行舟，不进则退 .
 */
public interface Notifier {

    FrontDeskLittleSister add(Observer observer);

    FrontDeskLittleSister del(Observer observer);

    void notifyObservers(String action);


}
